Sparking plug



Sept. 18,1923. mmm

- E. MARTIN S PARKNG PLUG Fild May. l5. 1925 INVENTOR. ELLH. MHRT/NATTORNEYS.

Patented Sept. 18, 1923.

n'r en ECEO SPARKI1\TG PLUG.

Application filed May 15,

To all w 7L077t t may concern:

Be it known that I, ELLA l\IARTIN, a subject of the United Kingdom ofGreat Britain andflreland, and resident at Vine COt-z tage, Bottesford,in the county of Nottingham, England, have invented certain new anduseful Improvements in Sparking Plugs, of which the following is aspecification.

This invention relatos to improvements in sparking plugs 'whereby theplug may be quickly and easilyremoved from the cylinder without breakingthe electrical connections, So that thespark may he inspected in afraction of the time now taken to break the electrical connections.unscrew the plug, and remake the connections. Further the constructionot the sparking plug facilitates the'renewal of damaged parts, and theease wit-h which the plug is removed from the cylinder renders itunnecessary to-provide, any other opening for priming.

Therordinary sparking plug consists of an. insulated high tensionelectrode fixed in a holden which screws into a hole in the enginecylihder. and from which the other electrode projects. The disadvantagesot this type are that the electrical connection h as to be brokenbeforethe plug can be unscrewed, the unsorewing'takes time, the electrical connection hast0 he remade before the spark can be tested, it isdifiicult to find resting.place for the plug where the'spark can be seenwithout the high tension termi nal touching any conductor, and if theplug falls the spark electrodes are liable to be bent and the insulationto be broken- According to this invention I employ a sparking plugwhich, instead of screwing, sldes in and out of a hole in the enginecy}; inderl and is attached thereto in such a way that the electricalconnections are not broken and the plug will not fall. As the ordinaryengine cylinder is not provided with a suitable hole or with a suitableplace for the attachment of the plug when out of the hole, I generallyprefer to attach the plug to a bush screwing into the hole provided forthe ordinary sparking plug. When.the engine is working the sparking plugmust make a tight joint with the cylinder and for thispurpose theattachment of the plug is provided with a screw or lever device whichwill press the plug into the hole and hold it firmly until released. Inorder that this A pressure may be applied from above with 'replaced.

1923. Serial No. 639,080.

out the attachment therefor either coming too near the high tensionterminal or occu pying too much space I make the plug with a right angiebend so that the terminal comes out at the side.

It will be obvious that the plug, being separate from the screwed bush,will be a smaller and cheaper thing to replace than the ordinarysparking plug. but I may make the high. tension electrode detachablefrom and the insulator from the any part of the plug can be the insulator, holder, so that In the drawings, illustrating what I now consider apreferred embodiment of my in vention, Fig. 1 is a side view, and Fig. 2is a section taken ou the line 22 of Fig. 1.

In the drawing A is the plug which slides into the screwed bush l3 andmakes a tight joint there ith when the shoulder m is pressed against thewasher w. This nres sure is produced by the screw S which is turned hythe handle 7L and nasses through a nut o pivoted at o to the linkmediate the bush B and the plug i are rings B and B which are providedto make a swi*.el connection so that the plug A may be opened in anyconvenient position. The link 7c is pivoted to the screwed ring P. sothat when the plug A. is in position the screw can press on the upperpart u and make a tight joint between the shoulder m and the wasl cr w.This is possible hecause the plu 1.:= made with a right angle bend sothat the high tcnsion terminal t comes out at the side through unextension 2' of the insulating material- As shown in Fig. f2, the bushvided with an external thread at its upper end to receive the flangedring B It is also counter-bored to receive a flanged tu hular member Bwhich swivels the ring B on the bush B in a manner readily understoodfSuit-able packing rings x, y, .2, may he provided es shown.

What I claim as mv invention and desire to secure by Letters Patent isThe combination of a sparking plug having a right angie bend, a link torattaching the plug to a ring adapted to swivel on a bush fitting in athreaded hole in the en gine,- and a sorew for making a tight joint 7c.Interbetween the plug and the bush.

ELLA MARTN.

